The problem everybody is ignoring with self-driving cars is that roads already are too expensive to maintain. Self driving cars will require tighter upkeep because they have lower margins for error, ballooning already ludicrous budgets to maintain the six million mile roadway network. Humans can drive drunk on wet gravel in the dark, but a computer needs full GPS, lidar, radar, and motion sensing cameras just to follow well painted paved roads. When there is no downtime and roads are constantly being used they will wear down faster and the computers will cause more crashes. Drains and manholes sink, paint fades, shoulders crumble, curbs deform, and bridges crack. Accelerate this by three, maybe four times and the entire nation will go bankrupt within a decade trying to pay to keep everything running just so autonomous cars can stay the default.